EP1331090B1 - Verfahren zur Herstellung einer elastischen, luftdurchlässigen Verbundfolie - Google Patents

Verfahren zur Herstellung einer elastischen, luftdurchlässigen Verbundfolie Download PDF

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Publication number
EP1331090B1
EP1331090B1 EP03000241A EP03000241A EP1331090B1 EP 1331090 B1 EP1331090 B1 EP 1331090B1 EP 03000241 A EP03000241 A EP 03000241A EP 03000241 A EP03000241 A EP 03000241A EP 1331090 B1 EP1331090 B1 EP 1331090B1
Authority
EP
European Patent Office
Prior art keywords
fibrous nonwoven
material webs
laminating unit
melt film
intermediate layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP03000241A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1331090A1 (de
Inventor
Markus Hamulski
Marcus Schönbeck
Georg Baldauf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mondi Gronau GmbH
Original Assignee
Nordenia Deutschland Gronau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nordenia Deutschland Gronau GmbH filed Critical Nordenia Deutschland Gronau GmbH
Publication of EP1331090A1 publication Critical patent/EP1331090A1/de
Application granted granted Critical
Publication of EP1331090B1 publication Critical patent/EP1331090B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/144—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0032—Ancillary operations in connection with laminating processes increasing porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/10—Fibres of continuous length
    • B32B2305/20—Fibres of continuous length in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/028—Treatment by energy or chemical effects using vibration, e.g. sonic or ultrasonic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/1092—All laminae planar and face to face
    • Y10T156/1093—All laminae planar and face to face with covering of discrete laminae with additional lamina
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
    • Y10T156/1092—All laminae planar and face to face
    • Y10T156/1097—Lamina is running length web

Definitions

  • the invention relates to a process for the production of an elastic, air-permeable composite film, which identifies an elastomeric intermediate layer and bilateral outer layers of non-woven fabric.
  • a composite film is used, for example, in the manufacture of diaper pants as elastic end cuff. It must be elastic and largely liquid-tight. To improve the wearing comfort it has a textile surface and is permeable to air.
  • a melt film of thermoplastic elastomer is fed to a laminating unit and introduced in the thermoplasticized state between two webs of non-woven fabric entering the laminating unit.
  • the molten intermediate layer of the multilayer material is cooled to solidification temperature, thereby producing a laminating composite with fibrous nonwoven cover layers.
  • the material is not permeable to air.
  • the invention has for its object to provide a method for producing an elastic, air-permeable composite film, with which a material of high bond strength can be made and in which the air-permeable areas can be determined application-related.
  • the number of process steps should be as low as possible, so that the composite film can be manufactured inexpensively.
  • the cooling of the molten intermediate layer is expediently carried out on a cooled steel roll in a nip of the laminating plant delimited by two rolls.
  • the elastomer layer is melted at discrete points by punctiform welds, the cover layers retaining their fibrous structures. It result in air-permeable areas that are covered by a fine fiber structure of the outer layers.
  • the fibers of the cover layers are incorporated into the thermoplastic material of the elastomer layer. This additional fixation of the nonwoven reinforces the already existing composite material.
  • the laminating composite is guided in the ultrasonic welding station via a welding roller with welding spikes projecting on the circumference, ultrasonic vibrations being generated at the contact surfaces between the welding spikes and the laminating composite.
  • the ultrasonic tool may in particular be designed in the form of two rollers, wherein one roller has a smooth circumferential surface and forms an abutment for the welding operation and the other roller is designed as a welding roller with circumferentially protruding welding spikes and represents the sonotrode of the tool.
  • the invention teaches that the melt film consisting of an elastomeric material is fed to the laminating unit in parallel strips spaced apart from one another and introduced between the material webs consisting of nonwoven fabric.
  • consisting of non-woven fabric webs are glued together in the areas between the melt film strips, wherein the adhesive is applied strip-shaped on at least one of the two webs before the inlet of the webs in the laminating.
  • glue are
  • hot melt adhesive can be used, which can be sprayed onto the web.
  • the spray nozzles can be arranged close to the cooled steel roller of the laminating plant.
  • the composite material web passes through the ultrasonic welding station in which permeable structures are produced in the elastic sections of the composite material in the manner already described.
  • a multilayer melt film to be produced by coextrusion and introduced in the thermoplasticized state between the nonwoven webs entering the laminating mill, at least one layer of the melt film consisting of a thermoplastic elastomer.
  • the material of the layers contacting the nonwoven fabric may be determined and optimized according to additional considerations. There are advantages, such as better control of the bond between the elastic core of the film and the outer nonwoven fabric. By suitable fixing of the material, furthermore, the resistance of the composite foil against environmental influences and against substances, e.g. be improved in skin protection products.
  • the use of a multilayer melt film produced by coextrusion is possible in all of the previously described embodiments of the method according to the invention.
  • the laminated composite produced by the process according to the invention can then be stretched in the longitudinal direction and / or transversely to the withdrawal direction or subjected to an incremental stretching.
  • By the aftertreatment gives the composite film in the stretched areas a higher elasticity.
  • the process shown in the figures is used to produce an elastic, air-permeable composite film which has an elastomeric intermediate layer and cover layers made of a nonwoven fabric.
  • a melt film 1 made of a thermoplastic elastomer is produced by extrusion and fed to a laminating unit 2.
  • the melt film 1 passes in the thermoplasticized state between webs 3 of a nonwoven fabric, which also enter the laminating 2.
  • the molten intermediate layer of the multilayer material is cooled to solidification temperature, whereby a lamination composite 4 with an elastomeric intermediate layer and cover layers of nonwoven fabric is formed.
  • the laminating composite 4 is then fed to an ultrasonic welding station 5, in which the elastomer layer is formed by punctiform welds while retaining the substance of the nonwoven fabric is melted at discrete locations by ultrasound. This creates air-permeable structures at the molten areas.
  • a welding roller 6 which has circumferentially projecting welding spikes 7.
  • the laminating composite 4 is guided over the circumferential surface of the roller 6, wherein 4 ultrasonic vibrations are generated at the contact surfaces between the welding spines 7 and the laminating composite.
  • the welding spikes 7 may be equipped with ultrasonic heads 8. In this case, however, other devices with which point-like ultrasonic welding of plastic films can be made, can not be excluded.
  • the melt film 1 is fed to the laminating unit 2 in parallel, spaced-apart strips 9 and introduced between the material webs 3 consisting of nonwoven fabric.
  • the nonwoven webs 3 are glued together in areas 10 between the melt film strips.
  • a multilayer melt film produced by coextrusion which in the thermoplasticized state between the layers in the laminating unit, can also be used as the melt film incoming material webs 3 is introduced.
  • Different materials can be used for the layers of the coextruded film.
  • At least one layer of the melt film consists of a thermoplastic elastomer.
  • the composite films produced by the process according to the invention can then be stretched in the longitudinal direction and / or transversely to the withdrawal direction or subjected to an incremental stretching in order to improve the elasticity of the material.
  • For the mechanical treatment can be made of known, not shown here facilities.
  • a compound based on styrene-ethylene block copolymer (SEBS) is extruded on a sheet-die extrusion line 11 with the addition of polyethylene copolymer.
  • SEBS styrene-ethylene block copolymer
  • the nozzle width is 1,000 mm.
  • the nozzle gap is set to 0.7 mm.
  • the melt is extruded directly into the laminating unit 2, which has a cooled steel roll 12 and a rubber roll 12 '.
  • Two layers of polypropylene nonwoven fabric are unwound and fed to the laminating unit 2 as outer material webs 3.
  • the polymer melt flows between the two layers of polypropylene nonwoven fabric and is cooled to the steel cooling roll 12 to below the solidification temperature.
  • the temperature of the steel cooling roll 12 is 60 ° C. Of the Laminating gap is set to 0.09 mm.
  • the composite material is supplied to the ultrasonic whitening station 5 and passes through a welding tool consisting of rollers 6, arranged in pairs.
  • a roller 13 has a smooth peripheral surface which serves as a tool abutment.
  • the other roller 6 is designed as a welding roller with circumferentially protruding welding spikes 7 and represents the sonotrode of the tool.
  • the ultrasonic welding tool consisting of two nonwoven fiber webs and an elastomeric intermediate layer composite film is selectively welded through, creating an air-permeable structure. At the ultrasonically welded points, the adhesion between the laminate layers is greater than in the surrounding areas.
  • a special extrusion die 14 is used, from which the melt film in parallel, spaced-apart strip 15 is fed to the laminating unit 2 and introduced between the webs consisting of nonwoven fabric material 3.
  • the consisting of a thermoplastic elastomer strip 15 have a thickness of about 100 microns and are 50 mm wide. The distance between the strips is 100 mm in each case.
  • a hot-melt adhesive based on styrene-isoprene-styrene block copolymer (SIS) is sprayed in strips on one of the tapered polypropylene non-woven fabrics 3.
  • the width of the hotmelt strips is 105 mm with a distance between the hotmelt strips of approx. 40 mm.
  • the hotmelt strips are positioned so that a bond occurs between the two fiber nonwoven webs in the areas 10, in which no elastomeric strips are present.
  • the composite material produced by the described method is then made permeable to air in the manner described above by ultrasonic welding and bonded at points. The result is an air-permeable composite film with elastic strip inserts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP03000241A 2002-01-23 2003-01-08 Verfahren zur Herstellung einer elastischen, luftdurchlässigen Verbundfolie Expired - Fee Related EP1331090B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10202333 2002-01-23
DE10202333A DE10202333B4 (de) 2002-01-23 2002-01-23 Verfahren zur Herstellung einer elastischen, luftdurchlässigen Verbundfolie

Publications (2)

Publication Number Publication Date
EP1331090A1 EP1331090A1 (de) 2003-07-30
EP1331090B1 true EP1331090B1 (de) 2006-08-16

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Family Applications (1)

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EP03000241A Expired - Fee Related EP1331090B1 (de) 2002-01-23 2003-01-08 Verfahren zur Herstellung einer elastischen, luftdurchlässigen Verbundfolie

Country Status (4)

Country Link
US (1) US7083691B2 (es)
EP (1) EP1331090B1 (es)
DE (2) DE10202333B4 (es)
ES (1) ES2266643T3 (es)

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Also Published As

Publication number Publication date
DE50304622D1 (de) 2006-09-28
DE10202333A1 (de) 2003-08-07
US7083691B2 (en) 2006-08-01
US20030136497A1 (en) 2003-07-24
ES2266643T3 (es) 2007-03-01
EP1331090A1 (de) 2003-07-30
DE10202333B4 (de) 2006-04-06

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